Spatial and spectral mode-selection effects in topological lasers with frequency-dependent gain
Year: 2021
Authors: Secli M.; Ozawa T.; Capone M.; Carusotto I.
Autors Affiliation: International School for Advanced Studies (SISSA), Via Bonomea 265, I-34136 Trieste, Italy; Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan; CNR-IOM Democritos, Via Bonomea 265, I-34136 Trieste, Italy; INO-CNR BEC Center and Dipartimento di Fisica, Universita di Trento, I-38123 Povo, Italy
Abstract: We develop a semiclassical theory of laser oscillation into a chiral edge state of a topological photonic system endowed with a frequency-dependent gain. As an archetypal model of this physics, we consider a Harper-Hofstadter lattice embedding population-inverted, two-level atoms as a gain material. We show that a suitable design of the spatial distribution of gain and its spectral shape provides flexible mode-selection mechanisms that can stabilize single-mode lasing into an edge state. Implications of our results for recent experiments are outlined.
Journal/Review: APL PHOTONICS
Volume: 6 (5) Pages from: 050803-1 to: 050803-9
KeyWords: EDGE STATESDOI: 10.1063/5.0041124